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Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (6): 1-5.doi: 10.11924/j.issn.1000-6850.casb15090058

Special Issue: 水稻

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Effects of Controlled Release Urea on Rice Yield, Nitrogen Use Efficiency and Soil Nitrate Nitrogen Content

Du Jun1, Sun Kegang1, Zhang Yunhong1, He Ailing1, Sun Kezhen2   

  1. (1Institute of Plant Nutrition, Agricultural Resources and Environmental Science, Henan Academy of Agricultural Sciences/Henan Key Laboratory of Agricultural Eco-environment, Zhengzhou 450002;2Gushi Agricultural Bureau, Gushi Henan 465200)
  • Received:2015-09-14 Revised:2015-10-16 Accepted:2015-10-22 Online:2016-03-07 Published:2016-03-07

Abstract: In order to investigate the effect of controlled release urea on rice yield and high efficient utilization of nitrogen under the conditions of equal amount of nitrogen fertilizer and reasonable fertilizer, field experiments were conducted to analyze the effects of controlled release urea (CRU) and common urea (CU) with different application doses on rice yield, nitrogen use efficiency and soil nitrate nitrogen content. The results showed that the highest yield of rice was 8986.5 kg/hm2 in the treatment of CRU100%. Compared with CU100%, the rice yield in the treatment of CRU 100% increased by 380.7 kg/hm2, the difference was significant. There was no significant difference in the rice yields between the treatments of CRU3/4 and CU100%, and CRU1/2 and CU100%, suggesting that 1/2 to 3/4 nitrogen application rate with CRU could get the same yield as CU treatments. The highest nitrogen use efficiency was 68.3% in the treatment of CRU1/2. Compared with CU1/2 treatment of the equal nitrogen application, the nitrogen use efficiency of CRU1/2 was increased by 20.6 percentage point. Meanwhile, CRU could slow down nitrate nitrogen accumulation in soil profile significantly. The application of CRU could evidently reduce the quantity of soil nitrate nitrogen leaching to deep soil layer and therefore lessen the risk of ground water pollution.